LC-MS Maps Grapevine Chemical Diversity

Grapes and grapevines hold major significance—not only for the wine and food industries, but also from cultural and scientific perspectives. This diversity is remarkable, encompassing thousands of distinct grape varieties along with numerous rootstocks and wild relatives. Surprisingly, however, no comprehensive study has yet examined the full chemical composition underlying this diversity, despite the value such insights could deliver for classifying grape varieties, guiding breeding efforts, and supporting more sustainable winemaking practices.

To fill this gap, a team of researchers from multiple countries created the Grape Metabolome (GM) Project, the first large-scale effort to use liquid chromatography-mass spectrometry (LC-MS) to study grapevine diversity in detail. The researchers analyzed 462 samples from 126 different grape varieties, collected over four different growing seasons. Using sophisticated data analysis tools, the team then was able to sort grapes into major chemical "types" and even pick up on more subtle differences between individual varieties. By digging into what specific compounds were driving these differences, they found patterns linked to things like anthocyanins (the pigments that give red and purple grapes their color), flavonols, aroma compounds, and tannins (which contribute to that dry, mouth-puckering sensation in wine). A paper based on their efforts was published in the Journal of Agricultural and Food Chemistry.¹

What Is the Chemical Complexity of Grapes, and Why Hasn't This Diversity Been Comprehensively Studied Before?

Grapes are chemically complicated, containing a huge—and not fully known—number of different compounds. These come from many different biological processes happening inside the plant, including the pathways that produce plant pigments and flavor compounds, those that create aromatic and scent-related molecules, processes involving amino acids and natural plant defense compounds, fat and lipid production, and the pathways responsible for sugars and acids.²

“Grapevine has therefore become a model species for research in plant secondary metabolism, stress biology, and food chemistry,” write the authors of the paper.¹Despite how important this is, there have been very few studies which actually taken a “big picture” look at the full range of chemical diversity across different grape varieties. Given how vast and globally significant grapevine diversity really is, the research team believed that there was a clear need for large-scale approaches that could capture thousands of different compounds at once, reliably identify what they are, and turn that information into reusable, large-scale data resources that the wider research community can benefit from.¹

While earlier studies using similar chemical analysis techniques have looked at how certain flavor/pigment-related compounds vary between grape varieties, those studies focused specifically on the woody parts of the vine—like canes and other wood biomass—and only looked at a narrower slice of the plant's chemistry, compared to the much broader picture of berry chemistry that this new project captures.^3,4In the team's view, what has been missing is a large, systematic, and publicly available study looking at the full range of chemical diversity across cultivated grape varieties.¹

How Did Researchers Use LC-MS to Map Grapevine Chemical Diversity, and What Value Does It Offer?

By combining LC-MS with careful quality checks and data adjustments, plus advanced pattern-recognition analysis, the researchers created an easy-to-understand "map" of grape chemistry. This map consistently separated grapes into their major chemical groups while also picking up on more subtle differences between individual varieties, including distinct subgroups like particularly aromatic grape types. By layering in information about specific compound families (like different types of pigments and flavor-related molecules) and how they relate to one another, the team was able to connect these chemical patterns to real, biologically meaningful differences between grape varieties, essentially bridging the gap between broad chemical "fingerprints" and the more specialized chemistry happening inside each grape.¹

Overall, this dataset serves as a valuable, expandable reference tool that is useful for classifying grape varieties, verifying authenticity and origin, discovering new compounds tied to biodiversity, and identifying promising traits for future grape breeding and winemaking.¹

“This study,” write the authors of the paper,¹ “establishes a comprehensive LC–MS-based grape metabolome resource and a practical framework to explore grapevine biodiversity through chemistry.”

The researchers believe that combining this project with genetic data in the future—along with identifying even more of the specific compounds involved—will make it an even more powerful tool for understanding and making use of the vast chemical diversity found in grapes.¹

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References

1. Arapitsas, P.; Franceschi, P.; Garcia-Aloy, M. et al. A Metabolome Atlas of Grape Biodiversity. J Agric Food Chem. 2026, 74 (35), 28014-28025. DOI: 10.1021/acs.jafc.6c04648
2. Waterhouse, A. L.; Sacks, G. L.; Jeffery, D. W. Understanding Wine Chemistry; John Wiley & Sons, 2016, 179-193. DOI: 10.1002/9781118730720
3. Billet, K.; Unlubayir, M.; Munsch, T. et al. Postharvest Treatment of Wood Biomass from a Large Collection of European Grape Varieties: Impact on the Selection of Polyphenol-Rich Byproducts. ACS Sustainable Chem. Eng. 2021, 9 (9), 3509-3517. DOI: 10.1021/acssuschemeng.0c07875
4. Ferrier, M.; Billet, K.; Drouet, S. et al. Identifying Major Drivers of Antioxidant Activities in Complex Polyphenol Mixtures from Grape Canes. Molecules 2022, 27 (13), 4029. DOI: 10.3390/molecules27134029